Minisymposium Presentation

The plasma-material interaction poses a common difficulty in all fusion concepts, affecting both armor material lifetimes and fusion plasma performance. With long experimental lead times, modeling and simulation are critical drivers for advancement. This work presents a framework and specific applications to accurately quantify the impacts of plasma sheath and material sputtering effects on materials. The software stack builds useful abstractions on top of exascale computing project-funded tools like Kokkos and Cabana to develop applications. The results of this work are presented for two target areas: the plasma sheath, including sputtering and feedback to the sheath, and the energy transfer of resonant ions in the ion cyclotron heating (ICH) region to non-resonant species. Results show prompt redeposition fractions and ion energy distributions of atoms that have returned to the surface. Temperature equilibration rates are shown for the ICH-heated edge plasma.

This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy.This research was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U. S. Department of Energy